6. [Analysis] Which colour flame would be produced by Mg when it is burnt?
No colour
Green
Brick red
Lilac
Golden-Yellow
7. [Analysis] What would happen if I added NaOH to a solution of a compound containing Cu 2+ ions?
Black CuO would form.
A white precipitate would form.
Nothing.
A light blue precipitate would form.
A reddish brown precipitate would form.
8. [Analysis] How would I detect NH4 + ions in solution?
Add NaOH > Warm gently > Gas turns damp blue litmus red
Add NaOH > Warm gently > Gas turns damp red litmus blue
Add HCl > Heat vigorously > NaCl is formed
Add NaOH > Warm gently > Squeaky pop test
Add NaOH > Add Al powder > Warm gently > Gas turns damp red litmus blue
9. [Analysis] I add NaOH to a solution containing X ions. A white precipitate forms. When I continue adding NaOH, nothing happens. What could X be?
Fe 2+ OR Fe 3+
NH4 + OR H +
Cu 2+ OR Fe 2+ OR Al 3+
Mg 2+ OR Ca 2+
K + OR Na +
10. [Analysis] I add acidified BaCl to a solution containing SO4 2- ions. What happens?
A blue precipitate forms.
Nothing.
A white precipitate forms.
A black precipitate forms.
A yellow precipitate forms.
11. [Analysis] I add NaOH to a solution containing NO3 - ions and warm it gently. What happens?
The squeaky pop test is positive.
The gas given off turns damp blue litmus red.
The gas given off turns damp red litmus blue.
Nothing.
An orange precipitate forms.
12. [Analysis] What happens when a halide solution (e.g: Br, I) is added to an unsaturated hydrocarbon?
Gentle effervescence.
Nothing.
Vigorous effervescence.
Decolorisation.
The mixture explodes.
13. [Analysis] What is the modern definition of an organic compound?
A compound based on the element C.
A compound based on the element O.
A compound that chars upon heating.
A compound based on the element H.
A compound that melts upon heating.
14. [Analysis] You are provided with a solution of chemical Y, an ionic compound. When NaOH is added to it, a reddish brown precipitate forms. When acidified AgNO is added, a cream precipitate forms. What is Y?
AlBr3
FeI3
NaCl
FeBr3
AlCl3
15. [Analysis] Chemical T is a carbohydrate. Exactly 4.08g of T is burnt, completely, in oxygen. 3.6g of water and 8.8g of carbon dioxide are produced. What is the empirical formula of T?
C5 H10 O2
C3 H6 O
C H2
C5 H10
C3 H3 O3
16. [Analysis] Atomic Absorption Spectroscopy (AAS) is used for what?
The quantification of carbon within a sample.
The destruction of NO3 - ions within a sample.
The identification and quantification of a particular element within a sample.
The identification of oxygen within a sample.
17. [Analysis] Which of the following substances is lemon yellow when hot, but white when cold?
MgO
ZnO
PbO
CuO
BaO
18. [Analysis] Chemical V, a hydrocarbon, is unsaturated. It is titrated against a solution of iodine, and it is found that it has one C=C double bond. To which group of hydrocarbons must V belong?
The alkines
The alkalis
The alkenes
The alkanes
Carbohydrates
19. [Analysis] Gel-permeation chromatography is used to...
Separate differently charged molecules.
Separate compounds according to the sizes of their molecules.
Separate compounds that are easily vapourised.
Separate compounds in solution.
20. [Water and Solubility] Which of the following processes is NOT used in the treatment of water?
